2. Specific Learning Objectives
Types of acquired immunity.
List the functions of natural killer cells.
Describe the role of T and B lymphocytes
in acquired immunity
List the types of T cells and their role in
acquired immunity
Describe T cell and B cell interaction
Compare and contrast innate and
acquired immunity
7. Humoral Immunity
Mediated by antibodies
Antibody mediated immunity/ B cell mediated immunity.
Defense against extracellular bacterial pathogens and viruses.
Immediate hypersensitivity reactions & Autoimmune
conditions.
Primary humoral response – first response to a specific antigen.
Secondary humoral response – subsequent response to the
same antigen.
8. Humoral Immunity
Antigen processing
and presentation
Recognition of
antigen by
lymphocytes.
Lymphocyte
activation.
Production of
antibodies
Inactivation of
antigen/ effector
phase.
9. IgM
•1st response to antigen
•Effective in agglutination
•Can’t cross placenta
IgG
•Most common form
•Crosses blood vessels
•Crosses placenta (passive
immunity to fetus)
IgA
•Secreted from mucus membranes
•Prevents attachment of bacteria to
epithelial surface
•In colostrum
IgD
•B cell activation
•Can’t cross placenta
IgE
•Histamine
reactions and
allergies
Immunoglobulin Classes
10. Humoral Immunity –
Effector Phase
Direct attack on
invading agents
Agglutination
Precipitation
Neutralization
Cytolysis
Attack on the antigen
through complement
system.